# coding: utf-8
#
# Copyright 2014 The Oppia Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, softwar
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Rules for CoordTwoDim objects."""

__author__ = 'Sean Lip'

from extensions.rules import base


class Within(base.CoordTwoDimRule):
    description = 'is within {{d|Real}} of {{p|CoordTwoDim}}'
    is_generic = False

    def _evaluate(self, subject):
        dx = subject[0] - self.p[0]
        dy = subject[1] - self.p[1]
        return dx * dx + dy * dy < self.d * self.d


class NotWithin(base.CoordTwoDimRule):
    description = 'is not within {{d|Real}} of {{p|CoordTwoDim}}'
    is_generic = True

    def _evaluate(self, subject):
        return not Within(self.d, self.p)._evaluate(subject)
